Sheet material with octagonal surface pattern



The sole FIGURE is a view of the sheet material with octagonal surface pattern, showing our new design; and

The bottom surface of the sheet material with octagonal surface pattern is plain and unornamented.

The claimed design is a two-dimensional pattern applied to sheet material surfaces such as clothing, fabrics, piece goods, bedding, and similar surfaces. The broken line boundary forms no part of the claimed design. 

The ornamental design for a sheet material with octagonal surface pattern, as shown and described. 